Higinbotham State Wildlife Managment Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higinbotham State Wildlife Managment Area clear sky chart from 2005-11-06 to 2024-02-25.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	12% 9% 4 8% 6% 4 5% 5% 5% 7% 34%	77988
	Night	11% 10% 5% 9% 7% 4 5% 5% 5% 7% 33%	81354
Transparency	Day	49% 6% 14% 23% 8% 1	77677
	Night	50% 6% 13% 21% 9% 1	81198
Seeing	Day	15% 9% 31% 28% 14% 3	15101
	Night	15% 7% 33% 33% 11% 1	25244

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	5% 12% 7% 15% 9% 5% 7% 6% 6% 7% 20%	2218
	11th to 20th	Day	5% 8% 5% 13% 15% 9% 12% 9% 6% 5% 13%	2287
	21st to end	Day	7% 15% 10% 18% 7% 4 6% 5% 4 6% 17%	2856
February	1st to 10th	Day	9% 12% 8% 10% 7% 4 6% 7% 8% 6% 24%	1710
	11th to 20th	Day	6% 12% 5% 8% 9% 6% 8% 5% 8% 9% 24%	1664
	21st to end	Day	7% 11% 5% 10% 10% 5% 9% 5% 5% 7% 25%	1430
March	1st to 10th	Day	13% 12% 6% 9% 9% 4 5% 5% 4 6% 27%	1883
	11th to 20th	Day	11% 11% 6% 9% 7% 4 3 5% 6% 8% 31%	1980
	21st to end	Day	13% 13% 4 10% 7% 3 5% 4 5% 6% 30%	2178
April	1st to 10th	Day	12% 12% 4 8% 7% 3 6% 5% 5% 7% 30%	2140
	11th to 20th	Day	17% 11% 4 7% 7% 4 5% 4 5% 6% 30%	2312
	21st to end	Day	19% 9% 4 8% 6% 3 4 5% 5% 7% 31%	2340
May	1st to 10th	Day	18% 9% 3 6% 4 3 4 4 4 7% 36%	2387
	11th to 20th	Day	14% 8% 2 6% 6% 4 5% 5% 5% 8% 37%	2479
	21st to end	Day	16% 8% 2 5% 5% 3 5% 4 5% 7% 39%	2902
June	1st to 10th	Day	15% 5% 3 5% 5% 3 5% 6% 6% 9% 39%	2700
	11th to 20th	Day	15% 5% 2 5% 5% 2 5% 5% 6% 9% 40%	2700
	21st to end	Day	11% 6% 3 5% 6% 4 5% 5% 6% 9% 39%	2700
July	1st to 10th	Day	7% 3 2 5% 5% 3 5% 6% 6% 10% 49%	2700
	11th to 20th	Day	10% 5% 2 5% 5% 3 4 6% 6% 8% 45%	2700
	21st to end	Day	6% 4 2 3 4 3 5% 5% 7% 9% 53%	2851
August	1st to 10th	Day	9% 4 3 5% 5% 3 5% 6% 7% 9% 46%	2328
	11th to 20th	Day	12% 6% 2 4 5% 2 4 4 6% 9% 47%	2301
	21st to end	Day	10% 5% 2 5% 4 2 3 4 5% 8% 51%	2574
September	1st to 10th	Day	12% 6% 2 4 4 2 3 4 5% 8% 50%	2208
	11th to 20th	Day	14% 7% 3 4 5% 3 4 4 5% 8% 44%	1984
	21st to end	Day	14% 7% 2 5% 5% 2 4 5% 6% 8% 42%	1980
October	1st to 10th	Day	17% 10% 3 7% 5% 3 3 3 5% 6% 38%	1814
	11th to 20th	Day	16% 10% 4 7% 4 3 4 4 5% 7% 36%	1800
	21st to end	Day	15% 12% 6% 9% 6% 4 5% 4 5% 7% 28%	1825
November	1st to 10th	Day	13% 14% 6% 9% 6% 3 4 5% 4 5% 31%	1528
	11th to 20th	Day	12% 14% 6% 13% 7% 4 5% 4 4 4 26%	1520
	21st to end	Day	11% 13% 5% 11% 9% 4 6% 4 5% 6% 26%	1520
December	1st to 10th	Day	10% 14% 8% 11% 9% 6% 7% 7% 6% 6% 17%	1368
	11th to 20th	Day	9% 15% 7% 10% 10% 4 7% 6% 5% 6% 21%	1679
	21st to end	Day	16% 14% 6% 12% 10% 5% 4 4 4 4 20%	2442
January	1st to 10th	Night	5% 10% 7% 13% 11% 7% 8% 7% 6% 6% 20%	4737
	11th to 20th	Night	5% 11% 6% 14% 14% 8% 10% 7% 6% 5% 13%	4682
	21st to end	Night	9% 16% 7% 14% 8% 4 6% 6% 5% 5% 19%	4809
February	1st to 10th	Night	8% 10% 5% 9% 7% 4 7% 7% 7% 7% 27%	2470
	11th to 20th	Night	7% 10% 4 8% 8% 4 7% 6% 6% 8% 32%	2403
	21st to end	Night	7% 10% 6% 9% 9% 5% 5% 5% 6% 7% 30%	1938
March	1st to 10th	Night	10% 13% 5% 9% 7% 4 6% 5% 5% 7% 29%	2064
	11th to 20th	Night	8% 9% 5% 7% 5% 4 6% 5% 5% 6% 40%	1979
	21st to end	Night	13% 11% 3 8% 6% 3 5% 5% 5% 8% 34%	2178
April	1st to 10th	Night	12% 9% 4 8% 6% 4 4 4 6% 8% 35%	1814
	11th to 20th	Night	16% 12% 4 6% 5% 3 4 4 5% 6% 35%	1599
	21st to end	Night	16% 9% 4 7% 5% 4 4 4 5% 6% 36%	1620
May	1st to 10th	Night	15% 10% 4 7% 4 2 3 4 4 6% 41%	1571
	11th to 20th	Night	15% 5% 3 5% 5% 3 5% 5% 6% 7% 39%	1416
	21st to end	Night	13% 5% 2 5% 5% 2 4 5% 6% 9% 44%	1371
June	1st to 10th	Night	12% 6% 2 4 3 2 5% 6% 7% 9% 45%	1260
	11th to 20th	Night	11% 3 2 5% 5% 3 5% 5% 6% 9% 46%	1260
	21st to end	Night	7% 5% 2 4 5% 3 5% 5% 7% 8% 48%	1260
July	1st to 10th	Night	5% 2 2 2 3 2 4 5% 6% 9% 59%	1260
	11th to 20th	Night	4 4 2 3 4 2 4 4 6% 10% 55%	1260
	21st to end	Night	6% 3 1 3 4 3 4 4 5% 10% 57%	1464
August	1st to 10th	Night	5% 3 2 5% 3 3 4 5% 5% 8% 57%	1611
	11th to 20th	Night	9% 3 2 4 5% 2 4 5% 7% 8% 52%	1600
	21st to end	Night	10% 3 2 4 5% 2 3 4 4 7% 56%	1782
September	1st to 10th	Night	11% 4 1 4 3 2 3 3 5% 9% 55%	1751
	11th to 20th	Night	11% 4 2 3 4 2 4 4 6% 8% 52%	1974
	21st to end	Night	15% 6% 2 4 4 3 4 4 6% 8% 46%	1980
October	1st to 10th	Night	16% 8% 3 5% 5% 2 4 4 6% 7% 40%	2128
	11th to 20th	Night	17% 10% 3 6% 5% 3 3 5% 5% 7% 37%	2160
	21st to end	Night	16% 12% 4 7% 5% 3 5% 5% 4 7% 32%	2528
November	1st to 10th	Night	12% 12% 6% 9% 6% 3 4 5% 5% 7% 33%	2550
	11th to 20th	Night	11% 14% 7% 11% 8% 4 5% 4 5% 6% 26%	2660
	21st to end	Night	11% 10% 5% 9% 8% 5% 6% 5% 5% 7% 28%	2660
December	1st to 10th	Night	7% 13% 6% 12% 9% 5% 7% 7% 5% 6% 21%	2812
	11th to 20th	Night	10% 13% 7% 14% 10% 4 6% 4 5% 5% 22%	3518
	21st to end	Night	19% 13% 6% 9% 8% 4 5% 5% 6% 5% 21%	5225

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	62% 7% 10% 17% 4	2219
	11th to 20th	Day	71% 6% 9% 11% 3	2287
	21st to end	Day	68% 5% 8% 14% 5%	2856
February	1st to 10th	Day	57% 6% 12% 17% 7%	1710
	11th to 20th	Day	55% 6% 13% 17% 8% 1	1673
	21st to end	Day	59% 7% 11% 16% 7%	1430
March	1st to 10th	Day	59% 5% 13% 18% 5%	1885
	11th to 20th	Day	52% 6% 14% 22% 6% 1	1980
	21st to end	Day	55% 6% 12% 20% 7%	2178
April	1st to 10th	Day	53% 6% 11% 19% 10% 1	2140
	11th to 20th	Day	55% 5% 12% 17% 11% 1	2312
	21st to end	Day	53% 5% 12% 20% 8% 1	2340
May	1st to 10th	Day	49% 5% 13% 21% 11% 1	2387
	11th to 20th	Day	45% 6% 11% 25% 11% 2	2483
	21st to end	Day	45% 6% 13% 24% 11% 1	2902
June	1st to 10th	Day	41% 7% 17% 25% 9%	2700
	11th to 20th	Day	40% 7% 16% 26% 10% 1	2700
	21st to end	Day	41% 7% 17% 27% 7% 1	2700
July	1st to 10th	Day	29% 9% 16% 33% 13%	2626
	11th to 20th	Day	35% 8% 18% 25% 13% 1	2619
	21st to end	Day	27% 8% 15% 37% 12% 1	2692
August	1st to 10th	Day	33% 9% 17% 30% 10% 2	2314
	11th to 20th	Day	35% 7% 18% 29% 10%	2301
	21st to end	Day	32% 6% 13% 34% 14%	2574
September	1st to 10th	Day	35% 6% 14% 31% 13% 1	2208
	11th to 20th	Day	40% 6% 18% 28% 8% 1	1984
	21st to end	Day	40% 7% 16% 32% 5%	1980
October	1st to 10th	Day	48% 6% 15% 23% 8%	1814
	11th to 20th	Day	48% 5% 13% 25% 9%	1800
	21st to end	Day	56% 7% 14% 17% 6%	1825
November	1st to 10th	Day	56% 6% 13% 17% 8% 1	1528
	11th to 20th	Day	63% 6% 10% 14% 7%	1520
	21st to end	Day	60% 6% 15% 13% 6%	1520
December	1st to 10th	Day	66% 7% 11% 13% 4	1368
	11th to 20th	Day	62% 6% 15% 13% 4	1680
	21st to end	Day	68% 5% 7% 16% 4	2442
January	1st to 10th	Night	62% 7% 12% 14% 4	4737
	11th to 20th	Night	70% 6% 9% 11% 4	4682
	21st to end	Night	65% 6% 10% 14% 4	4809
February	1st to 10th	Night	53% 7% 14% 19% 7%	2470
	11th to 20th	Night	49% 7% 13% 19% 12%	2404
	21st to end	Night	53% 6% 12% 20% 8% 1	1938
March	1st to 10th	Night	55% 6% 13% 19% 7%	2075
	11th to 20th	Night	45% 6% 12% 25% 12%	1980
	21st to end	Night	49% 6% 14% 20% 10% 1	2178
April	1st to 10th	Night	46% 5% 12% 23% 12% 1	1814
	11th to 20th	Night	50% 5% 10% 19% 14% 3	1599
	21st to end	Night	49% 5% 11% 23% 10% 2	1620
May	1st to 10th	Night	46% 5% 11% 23% 15% 1	1571
	11th to 20th	Night	41% 8% 12% 24% 13% 3	1417
	21st to end	Night	37% 6% 14% 27% 15% 2	1371
June	1st to 10th	Night	35% 7% 18% 29% 9% 1	1260
	11th to 20th	Night	35% 9% 14% 24% 15% 3	1260
	21st to end	Night	32% 8% 19% 32% 8% 2	1260
July	1st to 10th	Night	19% 9% 16% 38% 16% 2	1225
	11th to 20th	Night	24% 8% 19% 31% 17% 1	1218
	21st to end	Night	24% 6% 16% 33% 18% 2	1383
August	1st to 10th	Night	26% 6% 15% 36% 14% 2	1601
	11th to 20th	Night	29% 9% 17% 33% 12% 1	1600
	21st to end	Night	30% 6% 13% 34% 18% 1	1782
September	1st to 10th	Night	28% 7% 15% 35% 14% 1	1751
	11th to 20th	Night	30% 7% 19% 30% 13% 1	1974
	21st to end	Night	36% 6% 13% 33% 12%	1980
October	1st to 10th	Night	43% 6% 15% 25% 11% 1	2128
	11th to 20th	Night	47% 5% 12% 27% 9%	2160
	21st to end	Night	52% 6% 14% 21% 6%	2528
November	1st to 10th	Night	53% 5% 11% 20% 9% 2	2550
	11th to 20th	Night	60% 6% 12% 14% 7% 1	2660
	21st to end	Night	56% 6% 17% 15% 6%	2660
December	1st to 10th	Night	63% 6% 14% 13% 4	2812
	11th to 20th	Night	64% 5% 13% 14% 4	3516
	21st to end	Night	65% 5% 10% 14% 5%	5225

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	11% 10% 39% 26% 11% 3	270
	11th to 20th	Day	12% 7% 40% 30% 11%	270
	21st to end	Day	15% 8% 37% 26% 11% 3	297
February	1st to 10th	Day	11% 15% 39% 26% 6% 2	270
	11th to 20th	Day	10% 15% 43% 18% 13% 1	270
	21st to end	Day	8% 7% 41% 36% 8%	210
March	1st to 10th	Day	13% 14% 33% 30% 9% 1	240
	11th to 20th	Day	16% 9% 33% 23% 15% 4	240
	21st to end	Day	16% 13% 30% 31% 7% 4	264
April	1st to 10th	Day	18% 16% 32% 24% 8% 2	400
	11th to 20th	Day	24% 14% 29% 24% 8% 1	590
	21st to end	Day	22% 10% 31% 25% 12% 1	600
May	1st to 10th	Day	21% 12% 27% 29% 8% 3	603
	11th to 20th	Day	17% 9% 31% 27% 14% 2	625
	21st to end	Day	18% 8% 28% 28% 16% 3	679
June	1st to 10th	Day	12% 9% 26% 31% 18% 4	630
	11th to 20th	Day	15% 9% 34% 27% 13% 2	630
	21st to end	Day	11% 7% 30% 30% 17% 6%	630
July	1st to 10th	Day	8% 4 25% 35% 21% 8%	621
	11th to 20th	Day	12% 6% 31% 26% 20% 5%	618
	21st to end	Day	5% 3 26% 34% 24% 7%	684
August	1st to 10th	Day	7% 4 24% 35% 24% 6%	626
	11th to 20th	Day	13% 4 22% 34% 19% 9%	615
	21st to end	Day	13% 6% 25% 32% 20% 4	693
September	1st to 10th	Day	13% 8% 29% 32% 16% 3	498
	11th to 20th	Day	15% 10% 34% 29% 9% 3	274
	21st to end	Day	17% 10% 38% 21% 11% 2	270
October	1st to 10th	Day	19% 11% 26% 30% 10% 3	270
	11th to 20th	Day	16% 11% 34% 29% 8% 1	270
	21st to end	Day	21% 13% 35% 21% 7% 2	297
November	1st to 10th	Day	19% 11% 30% 29% 10% 1	270
	11th to 20th	Day	16% 19% 37% 22% 6%	270
	21st to end	Day	21% 14% 34% 27% 4	270
December	1st to 10th	Day	16% 11% 36% 30% 7% 1	270
	11th to 20th	Day	19% 14% 36% 26% 4	270
	21st to end	Day	18% 11% 34% 25% 10% 2	297
January	1st to 10th	Night	10% 8% 38% 30% 12% 1	950
	11th to 20th	Night	14% 7% 38% 33% 8% 1	950
	21st to end	Night	16% 8% 38% 30% 8%	1045
February	1st to 10th	Night	13% 8% 32% 36% 9% 1	950
	11th to 20th	Night	12% 8% 39% 28% 10% 2	929
	21st to end	Night	12% 7% 38% 29% 12% 2	718
March	1st to 10th	Night	14% 7% 35% 30% 12% 2	635
	11th to 20th	Night	11% 7% 39% 33% 8% 1	540
	21st to end	Night	20% 6% 32% 27% 12% 3	594
April	1st to 10th	Night	18% 8% 35% 30% 9% 1	540
	11th to 20th	Night	22% 8% 33% 27% 8% 1	533
	21st to end	Night	22% 6% 29% 31% 11%	540
May	1st to 10th	Night	19% 6% 32% 32% 9% 1	540
	11th to 20th	Night	17% 5% 34% 32% 11% 1	531
	21st to end	Night	15% 6% 36% 29% 14%	584
June	1st to 10th	Night	15% 4 27% 36% 17%	540
	11th to 20th	Night	12% 5% 31% 40% 11%	540
	21st to end	Night	9% 4 27% 41% 18% 1	540
July	1st to 10th	Night	6% 2 24% 45% 21% 2	525
	11th to 20th	Night	6% 3 29% 42% 19% 1	522
	21st to end	Night	7% 2 22% 44% 21% 3	591
August	1st to 10th	Night	7% 2 19% 51% 20% 1	537
	11th to 20th	Night	11% 3 22% 40% 22% 2	534
	21st to end	Night	11% 5% 25% 40% 18% 2	594
September	1st to 10th	Night	12% 4 26% 40% 15% 2	540
	11th to 20th	Night	12% 4 31% 39% 14%	540
	21st to end	Night	15% 6% 33% 33% 12%	540
October	1st to 10th	Night	20% 8% 33% 31% 8%	688
	11th to 20th	Night	22% 10% 33% 28% 8% 1	720
	21st to end	Night	22% 11% 32% 28% 7%	944
November	1st to 10th	Night	17% 9% 37% 29% 8%	925
	11th to 20th	Night	17% 11% 35% 29% 7% 1	950
	21st to end	Night	16% 11% 41% 25% 6% 1	950
December	1st to 10th	Night	14% 9% 36% 30% 10%	950
	11th to 20th	Night	19% 8% 39% 27% 7% 1	950
	21st to end	Night	23% 7% 34% 27% 8% 1	1045

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